Trail Mountain Bikes

Trail Bike Buyer’s Guide

Trail bikes (commonly referred to as “all-mountain bikes”) work well for many applications. They usually come from the manufacturer with two or three front chainrings, and may or may not have a chainguide or bash guard. This configuration provides suitable gear range to allow you to climb to the top of the hill and earn your descent. To be classified as a trail bike, frames and forks have anywhere between 4.5 and 6-inches of suspension travel, which is enough to have a fun ride down, even in the rough stuff. Both 26” and 29” wheel sizes are available. Depending on the components spec'd, most trail bikes usually weigh around 30-35 pounds and come with ~2.3-inch wide tires. If you're looking for a bike that can "do it all," this is the right type of bike to consider. While it won’t be perfect for everything, it can likely get the job done.

Typical Trail Bike

Things to Look for in a Trail Bike

Suspension: The quality of fork and rear shock play a major role in how a bike rides. The best suspension will feature rebound, compression, and preload settings.

Brakes: Brakes that perform well encourage you to ride better, simply because you know that when you need to stop or slow down, you can. Look for hydraulic disc brakes from a reputable brand (Avid, Hayes, Shimano, Magura, and Hope are all good brands).

Saddle: Since you’ll be seated a lot on a trail bike, it’s important that your bike has a comfortable saddle. Test a few out before making your purchase. Many shops will even allow you to swap saddles when you purchase a complete bike.

Seatpost: Height-adjustable (also known as “dropper”) seatposts are an incredible addition to any trail bike. They make it convenient to change your saddle height on the fly to the ideal position for the terrain you’re approaching. If this option is available to you, we highly recommend it.

Stem Length: On a trail bike, you’ll want a stem in the 50-70mm range. Anything longer and the bike will be difficult to steer in certain technical riding situations. We recommend a shorter stem and wider bars whenever possible.

Chain Retention: If you don’t want your chain to fall off while riding, look for bikes that have a chainguide on the front chainrings. It’s not very common for the chain to fall off without a chainguide, but it does happen occasionally.

Tires: Wider tires are often preferred for trail bikes because they offer more traction and flat protection. Look for tires ranging from 2.2 to 2.4-inches wide.

Trail Bike Frame Sizes

The most common way to size a trail bike is “standover” height, also known as inseam clearance. You want plenty of room between you and the top tube when you come to a stop, especially on uneven surfaces. As a rule of thumb, there should be at least four inches of clearance from the top of your inseam to the top of the top tube. Note that for some frame models the distance will be much larger than four inches due to a sloping top-tube. This is okay, provided the length and cockpit area of the bike fit you well.

Most manufacturers provide suggested sizing charts, and because models vary so much between categories, we recommend searching for the chart specific to the bike you’re interested in. It’s important to note that everyone has different riding preferences, so it’s best to test out a variety of sizes before making a final decision.

Men’s Trail MTB General Size Chart

Bike Size

Small

Medium

Large

Extra Large

Rider Height

<5'8"

5'7"-6'

5'11"-6'4"

>6'3"

Women’s Trail MTB General Size Chart

Bike Size

Extra Small

Small

Medium

Large

Rider Height

<5'3"

5'2"-5'7"

5'6"-5'11"

5'10"-6'2"

Trail Bike Frame Materials

The overall feel of a bike is largely dependent on what material(s) the frame is made of, so this is an important consideration.

Aluminum - Aluminum is light, stiff, and affordable, making it the most commonly used frame material. Because it is so stiff, aluminum bikes are characterized by a slightly rougher ride than those made from chromoly or titanium.

Carbon Fiber - Carbon fiber is basically very thin strands of carbon that can be twisted and woven together, like cloth. To make carbon fiber take on a permanent shape, it can be layered over a mold, then coated with a stiff resin or plastic. It is among the lightest materials and is commonly used for high-end cross-country and trail bikes. More recently it has found its way into some downhill and freeride frames. Because carbon technology is advancing very quickly, costs are being lowered and durability is increasing.

Chromoly Steel - Chromoly (a steel alloy) is lighter than high-tensile steel, strong, responsive, and offers a relatively supple ride. However, it is heaver than aluminum, carbon, and titanium.

Titanium - Titanium (also referred to as “ti”) is very light and stronger than steel. It is also very expensive, and for this reason is only seen in very high-end or custom frames. Titanium also offers a smooth ride because it flexes well.

Material Combinations - If a frame is made of more than one material, it is usually carbon fiber and a metal - either steel, aluminum, or titanium. Material blends are not common, but constructing various parts of a frame from different materials is (ie – a carbon fiber front triangle with an aluminum swingarm). A frame made out of more than one material can help provide better stiffness, compliance, or damping in specific areas.

Wheel Size

If you’re considering a trail bike, you’ll need to decided between 26 and 29-inch wheels. For many years, 26-inch wheels were the standard on these types of bikes, but recently 29-inch wheels (commonly known as “29ers”) have become increasingly popular. The larger diameter wheels roll over obstacles more easily and the tires can be run with less air pressure, providing better traction. On the other hand, larger wheels are heavier, more flexible, and there are fewer component and tire choices available. If you’re on the fence about wheel size, we highly suggest testing both sizes before making a purchase.

How Much to Spend

Deciding how much to spend is a tough decision. As a general rule, the more you spend the better bike you get. There will be major difference between a $900 bike and a $3500 bike. In general, the more expensive a bike is, the more durable it will be (at least until you start getting into the high-end where lightweight construction may reduce durability) and the better components will perform. If you’ll be riding regularly, we recommend spending at least $900 on a trail bike. Anything less and you’ll be constantly repairing the bike and replacing components. If you’re a first-time buyer, you may be tempted to purchase a low-end bike and later upgrade the components as necessary. Know that it is often much cheaper to buy the components on the bike in the first place than it is to buy components later and upgrade.

For comparison, the three bikes below are priced at $3000, $4400, and $7500, respectively.

Product Reviews

Be sure to do your research and read product reviews. Reviews are a great way to find out specifics about a particular model of mountain bike, user impressions, and things to watch out for or to upgrade right off the bat. After you’ve purchased a bike and had enough time to thoroughly test it, we encourage you to leave a review for other people to see when they are researching bikes on the web.

We hope you’ve found this information to be helpful. If you have a question that isn’t answered in this guide, our mountain bike forums are a great place to get advice from knowledgeable riders. Your local bike shop is also a great resource and the best place to test ride bikes before making a final decision.